Which device is designed to monitor the integrity of vapor recovery systems?

• A. ball float
• B. combustible gas indicator
• C. pressure gauge
• D. liquid level sensor

Answer: (B)

A combustible gas indicator is a crucial device in monitoring the integrity of vapor recovery systems. This device is specifically designed to detect the presence of combustible gases that may leak from the vapor recovery system. By continuously monitoring the environment for gas emissions, a combustible gas indicator ensures that any leaks or failures in the system are identified promptly. This is vital for both safety and environmental compliance, as leaks can lead to hazardous situations and regulatory violations.

The other options, while useful for various functions within a vapor recovery system, do not focus specifically on monitoring integrity. For instance, a ball float is typically used for liquid level measurement, a pressure gauge provides information about pressure levels but does not indicate gas integrity, and a liquid level sensor measures the level of liquid in a tank rather than gas or vapor leaks. Therefore, the role of the combustible gas indicator is essential in maintaining the safety and effectiveness of vapor recovery systems.